Noise reduction setting suggestion for CW

[Greg - AB7R]

During this weekend's contest I found a nice K3 setting combination for CW.

I have a 400 Hz roofing filter engaged and the contect filter set to ON in the narrow 400 Hz position.  Then turn NR on set to 5-2.  

73
Greg
AB7R
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[Bill W4ZV]

Greg - AB7R wrote

During this weekend's contest I found a nice K3 setting combination for CW.

I have a 400 Hz roofing filter engaged and the contect filter set to ON in the narrow 400 Hz position.  Then turn NR on set to 5-2.

Greg mean *context* filter which is also called dual passband (i.e. DUAL PB on the front panel).

73,  Bill

[Mike K2MK]

Hi Greg:

I remember reading a comment from Lyle on the reflector. He said that the
first four NR selections are optimized for CW and the last 4 are optimized
for SSB.  This happened a few months ago when 5 through 8 were added.
Previously we only had 1 through 4. Lyle is the DSP engineer.

For CW, I personally have been using 4-1 to 4-4 exclusively, however, I have
also found that 5-1 and 5-2 sometimes seem a bit better.

I rarely use SSB but I remember trying it after reading Lyle's posting and
the higher numbers did sound better on SSB.

73,
Mike K2MK

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[KK7P]

> I remember reading a comment from Lyle on the reflector. He said that the
> first four NR selections are optimized for CW and the last 4 are optimized
> for SSB.  This happened a few months ago when 5 through 8 were added.

The primary reason for this is that the delay through the denoiser
filter is not deterministic.  Selections 5-8 do a "wet and dry mix" of
processed and unprocessed audio. This can result in scalloping of the
signal amplitude, so the user's CW pitch may end up being emphasized --
or severely attenuated -- depending on the pitch, mixing setting, and
the amount of noise being suppressed.

It may well be that Greg's preferred pitch is one that gets mildly
emphasized through this action with the setting he uses.

73,

Lyle KK7P




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[Greg - AB7R]

Thanks for the explanation Lyle...that's exactly right.  Though I hesitated to use
the term, it actually acts like an APF for CW...at least with my settings it does.  
Pitch is set at 550 Hz and using DSP 5-2 and the context filter on.

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065


On Sun Nov 29 21:07 , Lyle Johnson  sent:

>> I remember reading a comment from Lyle on the reflector. He said that the
>> first four NR selections are optimized for CW and the last 4 are optimized
>> for SSB.  This happened a few months ago when 5 through 8 were added.
>
>The primary reason for this is that the delay through the denoiser
>filter is not deterministic.  Selections 5-8 do a "wet and dry mix" of
>processed and unprocessed audio. This can result in scalloping of the
>signal amplitude, so the user's CW pitch may end up being emphasized --
>or severely attenuated -- depending on the pitch, mixing setting, and
>the amount of noise being suppressed.
>
>It may well be that Greg's preferred pitch is one that gets mildly
>emphasized through this action with the setting he uses.
>
>73,
>
>Lyle KK7P
>
>
>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: [hidden email]','','','')">[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html

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